Lock



C. GARCIA Nov. 19, 1963 LOCK 6 Sheets-Sheet 1 Filed July 11, 1960 INVENTOR,

lfliiclln C. GARCIA Nov. 19, 1963 LOCK 6 Sheets-Sheet 2 Filed July 11, 1960 INVENTOR,

Se... s Y @g C. GARCIA Nov. 19, 1963 LCCK 6 Sheets-Sheety 3 Filed July 1l, 1960 C. GARCIA Nov. 19, 1963 LOCK 6 Sheets-Sheet 4 Filed July 11, 1960 v INVENTOR Wwf Nov. 19, 1963 C. GARCIA LOCK Filed July l1, 1960 6 Sheets-Sheet 5 5552 f4-ff 3f j www INVENTQR.

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Nov. 19, 1963 c. GARCIA LOCK Filed July 1l. 1960 6 Sheets-Sheet 6 United States Patent Oil ice 3,111,020 Patented Nov. 19, 1963 Argentina This invention refers in its broadest aspect to a lock, which may for instance be used in a door lock, a padlock and the like. More particularly, the lock is of the slide tumbler plate type, which according to one outstanding aspect is operable by a key, which when inserted in one way in the lock withdraws the tumblers from `the latch body which may thereby be moved with its bolt means to locking or unlocking position and when said key is inserted in a second way blocks said tumblers, so that the lock, if used as a door lock, may not be operated even with a pertinent key, inserted from the other side. It is obvious that when the lock is used as a door lock it will have front and rear key holes for that purpose. The invention relates likewise to the method of manufacturing said lock.

Slide tumbler plate locks so far known are manufactured by either arranging in the casing, in a predetermined manner, prefabricated tumblers of diferent shape, in which event the number of different keys and therefore different combinations is reduced to the number of preset arrangements, or each key has to be manufactured in accordance with the resulting unorganized arrangement of different tumblers, in lwhich event the movability of each tumbler in the casing has to be determined, so as to define the shape of the pertinent key, which is a very tedious and slow operation, since a feeler has to be inserted in each slot defining the housing of the pertinent tumbler, in order to command the movement of the grinder shaping the teeth of the key, as is known by those skilled in the art.

This drawback is overcome by the present invention, where keys may be manufactured of any possible and desired combination and each key is used for finishing its lock and more particularly for sett-ing the final size of the tumblers deiining the lock which is done by a fast leveling grinding operation without having to use a feeler or any other means to determine independently the particular structural features of each of the tumblers.

When the lock is used for door locks, the latch body requires only a single tumbler lock body which may be operated from both sides, which diifers from the common type of locks having a cylinder lock for each side and which operates a common latch or bolt arranged in between said cylinder locks.

In addition, the present invention uses a plate tumbler lock, wherein the tumbler plates comprise each one lateral mouth when the lock is used as a padlock, and a pair of lateral, opposite, aligned mouths, when the lock lis used as a door lock. The lateral mouth or mouths of one tumbler plate dene together with the mouths of the remaining tumbler plates one or a pair of main lines which face one or each one of the keyholes, so that the tumbler plates are operated from one of the side faces and .the key does not pass through the tumbler plates as happens in the orthodox arrangements. This facilitates the manufacturing of the tumbu'l-ar lock, as will be better apparent when referring to a specific embodiment.

Furthermore the lock of the present invention enables the `withdrawal of the lock casing from the lock without having to withdraw or disassemble the lock itself. This is an advantage, particularly for door locks, in order to be able to carry out repairs or to change the combination.

More particularly, the present invention consists in a lock comprising a casing, a latch body integral with at least one blocking means and slidably housed in said casing, a tumbler lock including a lock casing housing resiliently supported plate tumblers adapted to project out of said lock casing, said lock casing being stationarily mounted in said casing, said latch body dening slots in front of said plate tumblers whereby said plate tumblers are capable of locking said latch body, said casing having a side wall with a keyhole, each plate tumbler comprising la mouth facing said keyhole, a key for said lock and capable of being laterally inserted into said mouths through said keyhole.

The present invention furthermore refers to a method of manufacturing a lock including a casing, having a front wall, la fkeyhole in said front lwall, said casing having an open top and an open bottom, said method consisting in the steps of mounting a plurality of adjacently arranged plate tumblers in said casing, said tumblers each having a pair of side faces one of which of each tumbler at least including a mouth facing said keyhole, inserting a key having a stepped front bit through said keyhole into said mouths, and milling off the portions of said tumblers projecting out of said open top and bottom.

ln order to facilitate the compherension of the present invention reference will now be made to several specilic embodiments, by way of example in relationship to the accompanying drawings, wherein:

PIG. 1 ris a perspective View of a doorlock, to which the present invention has been applied.

FIG. 2 is an exploded perspective view of the doorlock shown in FIG. l.

FIG. 3. is a perspective view of the latch body in which the lock casing having integral cylinder members, is inserted.

FIG. 4 is an exploded perspective View of the lock casing, tumblers, spacers and door knobs.

FIG. 5 is a perspective View of a pair of aligned spacers and a slide tumbler in between.

FIG. 6 is a front View of one tumbler of the type used for door locks.

FIG. 7 is a perspective view of a package of spacers and tumblers with an inserted key, which enables the eX- planation of the method of manufacturing the lock.

FIG. 8 is a perspective view of the key.

FIG. 9 is a side elevation, partially in section, of the combination of latch body land tumbler lock, when the tumblers are locking the latch body.

FIG. 10 is a similar view as FIG. 9, but showing the lock with the key inserted, so as to free the latch body.

p FIG. 11 is a longitudinal section of the door lock mounted in a door.

FIG. 12 is a side elevation of the door lock with the snap latch land the bolt in locking and blocking positions, respectively.

AFIG. 13 is a similar view as FIG. 12, but with the bolt withdrawn into the casing.

FIG. 14 is a similar view as FIG. 12, but with the snap latch and bolt withdrawn into the casing.

FIG. 15 is a perspective view of a combined single piece slide tumbler and spacer member.

FIG. 16 is a perspective view, partially in longitudinal section, of a closed padlock, to which the present invention has been applied.

FIG. 17 is a perspective view of part of 4the padlock key.

lFIG. 18 is a perspective view of one spacer member and one tumbler of the type to be used in the padlock.

FIG. 19 is a perspective View of the lock casing and integral hollow cylinder member used in the padlock.

FIG. 20 is a longitudinal section of the padlock, but in open position.

FIG. 21 is a cross section of the padlock at the height indicated by section line XXII-XXII in FIG. 20, but with the lock in closed position.

FIG. 22 is a similar view as FIG. 21 but showing the pertinent portion pad-lock in unblocked position, and is therefore a true cross section along line XXII-XXIL FIG. 23 is la cross section of the padlock along line XXIII-XXIII of FIG. 20.

As may be appreciated from FIG. 1, wherein a door lock 1 -is shown as housed in a door 2, only shown in dotted lines, the door lock 1 comprisestwo half-casings 3 and 3 (see also FIG. 2) of which half-casing 3' supports in addition a front plate 4 through which emerges a snap latchS and also a bolt 6, which in FIG. 1 is shown in retracted position and which forms part of a latch body 7 (see FIGS. 2 and 3).

It lock 1 is to be used for instance `for a safe then the bolt 6 may be replaced by a pair of spaced apart bolts 6a and 6b as shown in dotted lines in FIG. 3.

The two half-casings 3, 3 (FIG. 2) are linked together for instance by screws 8, 8 and 9 of which screws 8 and 8 t into guide bushing 10 and 10', respectively, while screw 9 ts into bushing 11.

The snap latch is integral with la square stem 12 having a central longitudinal guiding slot 13 in which said guide bushing 10 lis housed, whereby the sliding movement of the snap latch 5 is limited. The rear end of square stern 12 comprises a blind bore 14 (see FIG. 12) in Iwhich one end of a compression spring 15 is housed, the other end 15 of which is located in a bore made to this eiect in the rear wall 3 of the half-casing 3'. Compression spring 15 urges the snap latch 5 outwardly. The square stern 12 has a vertical slot 16 adjacent said snap latch 15 to house the upper free end of a crank 17, pivoted on bushing 10', for operating the snap latch 5, las will be later explained.

It may already be appreciated that the snap latch 5 and its square stern 12 may easily be removed and inverted, so that the bevelled face 5 may be turned through 180 in order to enable the use of the door lock 1 for doors opening in one or in opposite direction, as will be readily understood by those skilled in the art.

Turning now to the latch body 7, reference is made to FIGS. 2 and 3 and it may be appreciated that bolt 6 is integral with an upper latch bar 18 and a lower latch bar 19 linked together by said 4bolt 6 and a rear `bar 20 (which may also be called side bars 6 and 20) so as to define in its middle portion an opening, wherein a lock casing 21 (FIG. 3) is housed.

The lock casing 21 comprises an outdoor plate 22 and an indoor plate 23 (see FIG. 4) the iirst of which is integral with a hollow outdoor cylinder member 24 andthe second with a hollow indoor cylinder member 25. The outdoor plate 22 and indoor plate 23 are linked together by side plates 26 and 27 of identical structure, each having in the embodiment of the door lock a slide slot 28. The corners of the outdoor plate 22 and indoor plate23 arerounded olf as indicated by reference numerals 29 and 29', to thereby `define a circular slide race on which the'recessed `free end 30 of a hollow indoor knob 31 and a similar recessed portion not visible in FIG. 4Y of a hollow outdoor knob 32 may run, as will be explained later on in detail.

IIt must beadde-d that rthe walls 22, 23, 25 and 26 may simply be called side walls whichever the position of lock casing 21 is. i

The two halcasings 3, 3' each comprises a cut-out portion 33, 33' (FIG. 2), respectively, defined by a lower half-square portion 34, 34', al pair of opposite tongues 35, 35 and an upper arcuate portion 36, 36', respectively. Assuming that the latch body 7 is ihoused in the casing 3, 3', then it willi-be understood that the lock casing 21 may be passed through the opening `defined by the upper latch bar 18 'and the lower latch bar 19 in such a way that the tongues 35 and 35 will enter in fthe slide slots 28. iI-t has to be added that the length of the side plates 4 26 and 27 in the portions between the rounded oi portions 29 and 29 is equal to the dis-tance existing between the outer faces of the two half-casings 3 and 3. Thus it will be understood that the lock casing 21 is stationary with regard to the two half-casings 3 and 3.

:The latch body 7 may slide along the lock casing 21 so that the bolt 6 may either project out of the front plate 4, as shown in FIG. 12, or be withdrawn into the casing 3, 3 as shown in FIGS. 1, 13 and 14.

:The upper and lower b-ars 18v and 19 are provided with a plurality of parallel, spaced apart, the lock casing 21 facing, upper and lower slots 37 and 38, respectively.

The upper bar 18 comprises in addition on both side faces a recess 39 (only one visible in FIG. 2 but both visible in FIG. ll), in which the stems 41 and 42 (FIG. 4) forming part of the i-ndoor knob 311V and outdoor knob 32, respectively, are to be housed for sliding the latch body 7 towards its two end positions, as shown in FIGS. 12 and 13, and to which reference will be made later on in detail.

As 'has already been explained, the lock casing 2'1 (FIG. 4) consists of an outdoor plate 22, an indoor plate 23 and the side plates 26 and l2.7, thus being completely open on top and bottom. The outdoor plate 22 (FIG. 3) comprises :a keyhole 43 of rectangular cross section and the indoor plate 23 (FIG. 4) comprises a similar keyhole 44. Keyholes 43 and 44 are aligned on a common horizontal plane (not shown).

Within the lock casing 21, a package of alternatively arranged spacers 45 and tumblers 46 is so arranged that it llis out said lock casing 21. As may be better seen in FIGS. 5 and 6, the spacers 45 are preferably of larger width than the tumblers 46. Each spacer 45 may be made of plastic material whilst the tumblers 46 are usually made of stamped metal. Each spacer 45 is substantially H shaped and thev size is substantially equal to the pertinent sectional size of the lock casing 21. Morev particularly, each spacer 45 defines in this embodiment a pair of oppositely arranged, middle lateral mouths 47 which face the keyholes 43 and 44, respectively, when housed in the lock casing 21.

In addition each spacer 45 comprises a pair of vertically aligned bores 48 and 4S' which preferably are slightly enlarged at Iboth ends as may be best appreciated in FIGS. 9 and 10.

The tumblers 46 (FIGS. 5 and 6) arranged inbetween spacers 45 are of somewhat more complicated shape. Each tumbler 461 comprises a pair of upper shoulders 49 and a pair of lower shoulders Sli, an upper tongue member 51 and a lower tongue member 52 projecting out inbetween said pair of upper shoulders 49 and lower shoulders 50, respectively. The total height of each tumbler 46, i.e., from the upper tongue 51 to the lower tongue 52 is equal to the height of the spacers 45. The side faces of each tumbler 46 have lateral inner mouths 53 and 53 which end in outwardly ared portions 54 and 54', respectively. Finally, each tumbler 46 has likewise a pair of vertically aligned bores 55 and 55.

The mouths 47 of the spacers 45 are all arranged at the same height. The mouths 53 and 53" as well as the entire blank tumblers 46 are likewise all of the same size. A package of alternately arranged spacers 45 and tumblers 46, having a total width equal to the distance existing between the side plates 26, 27 of the lock casing 21, is assembled by a pair of flexible members 56 and 56' (see FIGS. 4 and 9) usually rubber or resilient plastic rods. Said package lis then inserted into the lock casing 21.

A key 57 (see FIG. 8) is provided, consisting of a parallelepipedic bit 58 integral with a key rod 59. The front portion of the bit 58 is defined `by a plurality of H shaped portions 6b consisting of column members 61 all of the same height and slightly smaller than the mouths 47 (FIG. 5) of the spacers 45, so as to be able to snugly iit in, and cross members 62 (FIG. 8) linking said column members 64. The cross members 62 are located at different heights with regard to said column members 61, thus defining the combination of the lock.

Once the package of spacers 45 and blank tumblers 46 is inserted in the casing 21, the particular key 57 is inserted through either of the keyholes 43 or 44, whereby the column members 61 fit into the spacers 45 and the cross members 62 fit into the inner mouth 53 or 53 depending on the side in which the key 57 has been inserted, thereby moving the tumblers 46 into a particular position. Thereafter ia grinder 63, such as schematically indicated in FIG. 7 grinds on the top and thereafter on the bottom until the spacers and tumblers are at level with the top face 21 and bottom face 21 (only shown in FIG. 7, wherein the casing 21 is shown in dotted lines), whereupon the particular combination of the Alock yis ready.

When the key 57 is thus inserted 4in the lock casing 2l, as shown in FIG. l0, the flexible members 56 and 56 are out of line in accordance with the particular combination or position of the `different cross members 62 and at the same time the entire package of spacers 45 and tumblers 46 are, as aready stated, at level 'with the top face 21', and the bottom face 21". It will be appreciated from FIG. l0 that the flexible members 56 and 56' are only dephased in a small extent and due to the fact that the bores 48 and `48 of the spacers are enlarged at their ends, the flexible members 56 and 56' are not subject to substantially cutting forces which would unduly shorten the life of these flexible members 56, 56.

As soon the key 57 is withdrawn, the flexible members 56 and 56 straighten out, as shown in FIG. 9, whereupon the tumblers 46 project out in dilferent ways from the spacers 45 and if the lock casing 21 is mounted Within the door casing 3, 3', as previously explained, and therefore surrounded by the upper latch bar 18 and lower latch bar 19, and assuming that the rear bar 2t) is in contact with the side plate 27, as shown in FIGS. 9 and 10, the tongues 51 or 52 enter the upper slots 37 or the lower slots 38 of the upper latch bar 18 or lower latch bar 19, respectively, and thus block the latch body 7.

lf the key 57 is inserted, as shown in FIG. 10, then the latch body 7 is 'free to slide from the position shown in FIG. 10 to the position where the side plate 26 enters in abutting contact with the inner face 16 of the bolt 6 forming part of the latch body 7 (see also FIGS. l3 and 14).

It has thus be seen that the manufacture of any particular combination, depending on the pertinent key 57, is quite simple and does not require any preorganized mounting arrangement. It will be apparent to those skilled in the art, that when the key 57 is withdrawn from the lock casing 21, and upon insertion of said key 57 that the tumblers 46 which are out of alignment, will easily slide to the aligned or open position, due to the outer flared portions 54 or 54 of Ithe inner mouths 53 or 53. Furthermore, if the key is inserted instead of the proper way, as just explained, in opposite way, by previously turning said key through 180, which is likewise possible, since the keyholes 43- and 44 only define the outer rectangular contour of the key bit 58, the tumblers 46 will be moved into positions opposite to those of the open position, whereby the ears 51 and 52 will project into the upper and lower slots 37, 38 thereby blocking the latch body 7 in a definite way. It is thus impossible to open the lock by inserting another key through the other of the two keyholes. This concept is used for instance, when the lock operates as a door lock l1, in which event the 180 tu-rned key 57 would have to `be inserted through the indoor keyhole 44, so that from outside the door lock 1 `could not be opened even with a proper key.

When the lock casing 21 is housed in the cut-out portions 33 and '33', the lower half-square portions 34 and 34 (FIG. 2) will surround the lock casing 21 by passing along the lower shoulders 50 of the tumblers 46 and pertinent portion of the lower faces 45 ('FIG. 5) of the spacers 45, thereby preventing the package of spacers 45 and tumblers `46 to slide downwardly and thus retaining the package in proper position in the casing 21. The way that the package of spacers 45 and tumblers '46 is retained by the lower half-square portion 34 and 34 may also be appreciated in FIG. lil.

Turning once more mainly to FIG. 3, it may be seen that the hollow outdoor cylinder member 24 surrounds the keyhole `43 and has an outer retainer ring channel 64 Iadjacent the outdoor plate 22. The fnont face 24 of the hollow outdoor cylinder member "24 is closed by a front plate disk 65 having a crown gear periphery 66 which is press fitted into the cylinder member 24, thereby being blocked against rotation. Thereafter by means of a stamping tool (not shown), a portion of the front face 24 is overlapped as a lip 67 over the front disk 65 thus defining a good pick-proof fitting which is cheap to manufacture. The front disk `65 comprises a frontkeyhole 68 which is of substantially rectangular cross section with a circular central portion 69 which enables to turn therewithin the key rod 59, as will be later apparent.

Prior to mounting the front disk 65, an intermediate disk 70 is press fitted into the middle portion of the hollow outdoor cylinder member 24. The intermediate disk 7 tl has a pair of diametrically spaced apart eans 711 which fit into corresponding longitudinal slots 72 of the cylinder member 24 (only the upper slot is visible in FIG. 3). Said longitudinal slots 72 are blined slots inasmuch as they only enter up to the middle portion of .the cylinder member 24, so that the `disk 70 may be press fitted into the `cylinder member 24 until reaching the blind end. Coaxial with the ears 71 the intermediate disk 70 has an intermediate keyhole 73, arranged at 90 with regard to the front keyhole 68 and the keyhole 43. This arrangement provides an additional safety Ifactor against picking the lock, since it will be realized that for inserting the key 57, the key bit 58 has first to be inserted in such a way as to pass the front keyhole 68 and `then the key rod 59 has to `be turned in 90 within the circular central portion 69, so that the key bit 58 may pass through the intermediate keyhole 73, whereupon the key rod 59 has again to be turned through 90 within the circular central portions 69 and 69 Ito be able rto pass through the keyhole 43 into the lock casing 21. Thus, if the lock is intended to be picked, Athe skeleton key could only have the size of the circular central portions 69, 69' and this being insufficient to open the lock.

The hollow indoor cylinder member 25 does not require an intermediate disk 7 0, because the additional safety factor is not required for the indoor side and therefore, it will be sufficient to provide said hollow indoor cylinder member 25 with an indoor disk 74 (FIG. ll)

The hollow indoor cylinder member 25 has an inner retainer ring channel 75 (FIGS. 3, 4 and ll) adjacent the indoor disk 7-4.

The hollow outdoor knob 32 (FIGS. 2, 4 and 11) is mounted on the hollow outdoor cylinder member 24, and said knob 32 comprises a threaded bore 76 wherein a screw 77 (FIG. ll) -is mounted entering the outer retainer ring channel 64, whereby the knob 32 may only rotate about the cylinder 24. Obviously, several circumferentially spaced apart screws 77 :may be.` provided.

Once the knob 32 has thus been mounted on the outdoor cylinder member 24 the latter is slid into the casing 3, `3 by first inserting the hollow indoor cylinder member 25, whereby the stem 42 will enter the 'recess '39 of the latch body 7 and since the outdoor retainer ring channel 64 is arranged adjacent the outdoor plate 22 of the lock casing 21, said screw 77 will be arranged underneath the door 2 and thus is not accessible from outside. Once the assembly of knob 32, lock casing 21 with the package of spacers 45 and tumblers `46 is mounted in the two half-casings 3, 3 and has thus passed through the latch body 7 in away that top and bottom faces 21', Z1 of the lock casing 21 faces the upper and lower slots 37, 38, whereby the stem 42 has passed through the upper arcuate portion 36 of the cut-out portion 33, and entered the pertinent recess 39, the hollow indoor cylinder member 25 emerges out of the cnt-out portion 33', whereupon the hollow indoor knob 31 may be slid onto the indoor cylinder member 25 and its screw(s) 7.8 (FIG. 11) may enter the inner retainer ring channel 75, whereby the stern 41 will pass through the -upper arcuate portion 36 into the pertinent recess 39 of the latch body 7. As a difference yover the outdoor screw 77, the indoor screw 78 is accessible from outside, so that by loosening said screw 78, it is possible to dis-mount the hollow indoor knob 31, thereby without having to dismonnt the entire door lock 1, it is possible to withdraw the lock casing 21 Ias well as the latch body '7.

As may be seen in FIGS. 1 and 2, the door lock 1 comprises -in addition a pair of outer ornamental cover plates 79, 79.

, If the key 57 is inserted in the lock so that the latch body 7 is free to slide, and assuming that the bolt 6 is in the blocking position as shown in FIG. 12, then upon rotating knob 32 in counter clockwise direction, as indicated by arrow 80, through a certain extent, until entering the bolt 6 into the front plate 4, as shown in FIG. 13 the bolts 41 and 42 will adopt the position shown in FIG. 13.

In case of the door lock 1, the stems 41 and 42 are adapted to carry out a further counterclockwise portion of movement from the position shown in FIG. 13 to the position shown in FIG. 14 in order to withdraw the snap latch 5. To this end the crank 17 pivoted on the guide bushing enters with the free end of arm 17' into the vertical slot 16, while the other arm 17 is pivoted to a pair of follower hook arms 81 and 81 (FIG. 2) by means of pivot 82, so that between said pair of follower hook arms 81, 81 the latch body 7 may pass through. The hooks 83 and 83' are always within the path of the stems 42 and 41 respectively, due to the guide pin 84. Thus upon continuing the rotation of either knobs 31, 32 both stems'41, 42 will respectively hook the hooks 83', 83 and thus carry out the clockwise rotation in the direction of arrow 85 (see FIG. 14)Whereby the compression spring is compressed and the snap latch 5 pulled into the casing 3, 3'.

Instead of using a package of spacers 45 and tumblers 46 according to a more economic embodiment, com-g bined spacer and tumbler single piece members 86 as shown in FIG. 17 could be used. These single piece members 86l each consist of a main body 89, an upper ear 87 and a lower ear 88 arranged in the same plane and dening likewise the rear face 90 of the single piece member 86. The main body 89 is of larger width than the ears 87 and 88. The side faces 91 each define a lateral inner mouth 92 and a flared outer portion 93, similar to portions 53 and 54 of the embodiment shown in FIG. 5. Finally, each single piece member 86 has likewise a pair of vertically aligned bores 94.

This embodiment, although cheaper has the drawback that the exible members to be housed in the bores 94 of the package of single piece members 86 are subject to larger deformations. It is not considered necessary to redescribe the mounting and operation of the lock using these single piece members 86, since this will be obvious to anybody skilled in the art in view of the previous eX- planations.

The lock according to the present invention may, of course, be applied to cases where a key is to be inserted only from one end, for instance in the case of a padlock as shown in FIG. 16. In these cases, where the lock is to be operated only from one side, the spacers and tumblers need only one side mouth each, if the lock is to be manufactured according to the principle, as shown in FIG. 5. In this event, as shown in FIG. 18, each spacer 95 comprises one lateral mouth 96 and the usual pair of vertically aligned bores 97 adjacent an uninterrupted side wall 98. Each tumbler 99 has an inner lateral mouth 100 connected to the outer ared portions 101 and has likewise a pair of vertically aligned bores 102 adjacent to an uninterrupted side wall 103. The tumbler 99 further comprises a pair of opposite tongues 104 and 105, respectively.

Obviously, embodiments using the combined spacer and tumbler single piece members 86, as shown in FIG. 15 could likewise have an uninterrupted side wall and only one side inner mouth, if they are to be used for a lock to be operated only from one side.

Spacers and tumblers 99 are again shown in FIG. 16 arranged within a lock casing 106 (see also FIG. 19) integral with a hollow cylinder member 107 housing in this embodiment a front disk 108 including a front keyhole 109, similar as the front keyhole 68. Although in the hollow cylinder member 107 no intermediate disk is shown, such an intermediate disk, similar to intermediate disk 70, could be supplied. The cylinder member 107 is connected to the lock casing 106 by a stepped portion 110 having a parallelepipedic inner slot 111 deiining the inner keyhole arranged at 90 with regard to the front keyhole 109 and is spaced apart from the package of tumblers 99 and spacers 95.

The casing 106 comprises a pair of oppositely arranged lateral windows 112 (located in opposite side faces 40) of which only one is visible in FIG. 19, through which the tongues may project (in FIG. 19, tongues 104 are visible).

The upper face 106 of the lock casing 106 comprises a threaded blind bore 113 and below the window 112 and below the package of spacers and tumblers 95, 99 a bore 114 exists in which a key lock pin 115 (not shown in FIG. 19, see FIGS. 21 'and 22) Iis slidably housed.

The padlock casing 116 (FIGS. 16 and 20) comprises a vertical central blind stepped bore 119 in which the lock casing 106 with its integral hollow cylinder member 107 is t from the bottom, so that the upper face 106 enters in contact with the base of the last mentioned blind bore 119 and a screw 117 is screwed into the threaded blind bore 113 from the top 118. The screwhcad of screw 117, as is known, is thereafter milled so that the screw 117 may not be unscrewed by a screw driver. The padlock casing 116 comprises a pair of lateral blind bores 120 and 121 parallel to the central blind stepped bore 119 but having their mouths 120' and 121 in opposite direction, with regard to the central blind stepped bore 119 which denes a projecting mouth 122 from the base 123. In other Words, the mouths 120 and 121 (see FIG. 20) are arranged in the top 118.

The padlock casing 116 further comprises a crosschannel 124 located at the height of the lock casing 106 when fit into the central blind stepped bore 119 and passing through said bore 119 and the lateral blind bores 1Z0 and 121. The cross-channel 124 has usually a rectangular cross section.

A hand operable latch body 125 is yslidably housed within the cross-channel 124 and comprises a pair of knurled side faces 126 and 127, a pair of side passages 128 and 129, the cross section of Which is larger than the cross section of the lateral bland bores 120 and 121, respectively, so as to be able to dene a pair of uninterruped passages as shown in FIG. 20. The upper portion of the latch body 125 defines a pair of detents 130, 131, projecting into said side passages 128 andV 129, respectively. Both `detents 130 and 131 are orientated in this embodiment, in the same direct-ion. The latch body 12S further comprises a central passage 132 having in its upper portion (FIG. 23) the usual slots 13:3, the equivalent of which would be the upper and lower slots 37 and 38 of the latch body 7, and a recess 152 in the side wall forming part of the detent 131 to house therein the end of a compression spring 135 (FIG. 16 and FIG. 23), the other end of which butts against the pertinent side face of the lock casing 106.

The lower portion of the central passage 132 corresponding to the portion defined below the windows 112 (FIG. 19), does not have the slots 133 as may be appreciated in FIGS. 21 and 22, but comprises a cam portion defined by a recess portion 136, a sloped portion 137 and a blocking portion 133. The cam portion 136, 137, 138 is in operative contact with the key lock pin 115, as will be later explained in more detail.

The lock casing 1116 is arranged within the central passage 132, similarly as the lock casing 21 is arranged within the latch body 7 (FiG. 3).

The padlock further comprises a Ushaped bow 139 having a longer branch 111! and a shorter branch 141, the free end portion of lwhich Ihas a recess 142 (FIGS. 16, 20). The longer branch 149 comprises an axial blind bore 143 in which a compression spring 144 is housed and butts against the base 121, thereby upwardly urging the U-shaped bow 139 from the blocked position as shown in FIG. 16, 'towards the open position as shown in Fl'G. 20.

The longer branch 1411 further comprises, within the portion arranged in the longitudinal blind bore 143, an annular peripheral recess 145 spaced apart rfrom the free end 1411. A vertical .upstanding recess 146 is connected to said annular recess 145 and made within the longer branch 140. A guide and stop pin 1147 is mounted in the padlock casing 116 and penetrates the vertical upstanding recess 145 (FIG. 16) or the annular recess 45 (FIG. 20).

Finally, the key 1418 (FIG. 17) comprises a bit 149 and a key rod 1513', similarly as the key shown in IFIG. 8, but in addition the bit 149, preferably in the unmilled portion 141;', has a spherical cup shaped depression 151 complementary to the cap shaped end 1155' (FIG. 21) of the key lock pin 115.

As tothe assembling and functional aspect of the padlock, it may be appreciated that in View of the fact that the lateral blind bores `1211 and 121 could be made of the same size, it would be indistinct Whether the longer branch 149 is to be mounted in one or the other side bore 1211 or 121, as will be apparent to those skilled in the art. In order to assemble the padlock, the compression spring 1414 is iirst housed in the axial blind bore 143 at the same time as the latch body 125 is slid into the padlock casing 116 through the cross-channel 124, so that the side passages 123 and 129 are aligned with the lateral blind bores 1211 and 121. Thereafter, the U-shaped bow 139 is inserted through the openings 120 and 121 into the padlock casing 116 until the yfree end 140 butts against the base 121, whereby the shorter branch 141 will likewise be partially inserted into the lateral blind bore 12? and side passage `123, as shown in FIG. 16. Then, the guide and stop pin 147 is t into the padlock casing 116, so that the free end of said guide and stop pin 147 enters the vertical upstanding recess 146. The outer surface, at least around the guide and stop pin 147 of the padlock casing 116 is then milled, as is known in the art.

The latch body 125 supports by means of its recess 152 (FIG. 16) the compression spring 135 and the de tents 1311 and 131 are moved -to enter the recesses 142 and 142', which facilitates the insertion of the lock casing 1116 and integral hollow cylinder member 1117 through the projecting mouth 122. The upper face 166 enters in abutting contact with the padlock casing 1116 and screw 117 is then screwed into the threaded blind bore 113 and the top 113 is milled at least around the screw head of screw 117, as previously explained. Obv-iously, during the mounting of the lock casing 1116 and integral hollow cylinder member 107, Ithe key 148 is inserted so that the tongues 1114 and 165 are withdrawn into the lock casing 1116.

As to the operation of the lock and assuming that the key 148 is withdrawn from the padlock, and the padlock is closed as shown in FIG. 16, in order to open said padlock, it is necessary to insert the bit 149 through the front keyhole 109 to turn it through 90 to pass through the slot 111, so that said key may enter the mouths 96 of the spacers 95 (FIG. 18) and inner lateral mouths 100 of 10 the tumblers 99, thus withdrawing the tongues 104 and 1115 from the recesses 133 (FIG. 23). It is now possible to slide the latch body 125 in the direction indicated by anrow 153 in FIG. 16, compressing the spring 135 andV lwithdrawing the rdetents 1311 and 131 from the recesses 142 and 142', whereupon the spring 144 (FIG. 20) urges the bo-w 139 'upwardly and thus the `free end 141 emerges out of the opening 1241', and the padlock is opened. At the same time, the latch body 125 is retained in its unblocking position due to the `fact that the detent 131 is unable to move in opposite direction, since it contacts the unrecessed portion of the longer branch 140. Likewise during the upward movement of the bow 139, the vertical upstanding recess 146 slides along the guide and stop pin 1147 until the latter enters the annular recess 145 and is retained by the lower ilange 145 thereof, 'whereupon the upward movement of the bow 139 is stopped, but may now rotate about the longitudinal axis (not shown) of the longer branch 1li-t).

Finally, upon insertion iof the key 148 and before sliding the latch body 125 in fthe direction indicated by arrow 153 (FIG. 21), the spherical shaped depression 151 will be llocated in `front of the cap shaped end L of the key lock pin 115. As soon as the latch body slides towards the unblocking position, as shown in FIG. 22, the ca-rn portion, and more particularly the sloped portion 137 will `gradually press the key lock p-in 115 into the spherical cup shaped depression 151 Where it will stay blocked :as soon as the key lock pin 115 is Iblocked in its penetrating position by the blocking portion 133 of the latch body 125, whereupon it is not possible to withdraw the key 143 while the padlock is open.

To close the padlock, all that is necessary is to insert the -free end 1411 of the shorter branch 1411 through the opening 1211 into the lateral blind bore 120, so that the recesses 41412 and 1412 face fthe detents 13) and 131, whereupon the spring will slide the latch body 125 in the direction opposite to that of arrow :153 so that the recesses 133 (FIG. 23) will 'face again the tongues 1M- and`15 at the same time as the key lock pin 115 is again in the position shown in FIG. 2l, thereby liberating the key 148 which may then be withdrawn, whereby ,the tongues 1114 and 105 will renter the recesses 133, thus blocking again the padlock.

It will be obvio-us Ito those skilled in the art, that if the feature of the key `lock pin 115 is not provided, that the padlock may likewise operate, but in that event it would be possible to withdraw the key 148 when the padlock is open and it would be necessary to reinsert the key 143 in order to be able to close again the lock.

lt may be added ythat it is possible 'to provide a nulmber of :modifications within the above concepts as long as they zfall within the scope of the appendant clairns; for instance it would be possible, in `order to block the lock, instead 'of turning the key through 1810", provided that the keyhole is longer than the key bit, to sidewise slide said key bit so that the H shaped portions 61) (FIG. 8) do not enter in the correct spacers and tumblers `for opening, that is to say, withdrawing the tumblers: into the lock casing. It is likewise possible to conceive a latch body which has for instance only one latch bar with slots facing the window-like opening and in that event the lock casing would require only one window-like: opening and said latch bar would have to be provided with stop means to limit `the sliding movement thereof. Furthermore, if -the slide tumbler means-consisting either of the assembly of spacers 45 and 'tumblers 46 (FIG. 5), or of the combined spacer and tumbler single piece members 86 (FIG. 15), or of the assembly of spacers and tumblers 95, 99 (FG. 18)-are arranged in the lock casing without any flexible member of the type of rubber rods 56, 56 (FIGS. 9 and 10), then the arrangement will still be operative as long as the tongues fall into locking position by gravity.

means being arranged at a different height than the remaining mouths, and a key having a stepped flat bit for frontwise insertion through said keyhole .into said -mouths to withdraw said tongues from said slots into lock casing when inserted in one way and to block said slots when inserted in another way, said side wall having said keyhole being integral with a hollow cylinder member surrounding said keyhole, said hollow cylinder member having -a front face, a :front disk having a front keyhole fitting into said front face, said front keyhole being aligned with regard to said keyhole of said side wall, said keyhole in said side wall being iof rectangular cross section, said front keyhole being of similar rectangular cross section but includ-ing in addition a circular cent-ral portion, said key further comprising a key rod adapted to rotate in the said circular central portion, said hollow cylinder member further comprising an intermediate disk arranged between said side wall including said keyhole and said front disk, said intermediate disk including an intermediate keyhole similar to said front keyhole and dephased with regard to said keyhole of said side wall and said iront key hole.

11. The lock as claimed in claim lO, wherein said front disk has a crown vgear periphery, pressure fit into -said hollow cylinder member, and a ilip of said hollow cylinder member is stamped out of and over said front disk, said intermediate disk having a pair of diametrically opposite ears, a pair of diametrically opposite blind slots inside said hollow cylinder member, said intermediate disk being pressure lit into sai-d hollow cylinder member and said ears entering said blind slots.

l2. A door lock comprising two half linked casings, a front plate linked to one of said half-oasings and covering the other of said half-casings, a latch body comprising an upper latch bar, a lower latch bar parallelly spaced apart from said upper latch bar, a rear bar, and a bolt spaced apart from said rear bar, said rear -bar and bolt being integral with said latch bars and defining therewith a central opening, said latch body being slidably housed inside said two half-casings 'and said bolt ybeing adapted to project out through said front plate, said upper latch bar `and said lower latch bar having a plurality of adjacent upper and lower slots, respectively, facing each other and arranged nearer said rear har than said bolt, said upper bar further having a pair of side faces, a recess in each of said side faces adjacent said slots and inbetween said slots and said bolt, a cut-out portion in each of said two half-oasings consisting respectively .of a lower half-square portion, and an upper arcuate portion, a pair of tongues projecting into said cut-out portions between s-aid lower half-square portions and said upper arcuate portions, a. tumbler lock including a lock casing having an outdoor plate, an indoor plate parallel to said outdoor plate iand a pair of side plates linking said indoor plate with said outdoor plate, an external side slot in each of said side plates and complementary to said pair of tonfr'ues, said outdoor plate, indoor pla-te and side plates defining an upper and a lower window-like openings in planes perpendicular to said side walls, said outdoor plate and said indoor plate each having a keyhole of rectangular cross section; a hollow outdoor cylinder member integral with said outdoor plate and .surrounding its keyhole, a front disk and an intermediate disk mounted in spaced apart relationship in said hollow outdoor cylinder member land each having a keyhole of rectangular cross section including a circular central portion, said keyhole of said intermediate disk being d'ephased with regard to said keyhole and said front disk keyhole which is in phase with said keyhole tof said outdoor plate, an outer retainer ring channel in said hollow outdoor cylinder member adjacent said outdoor plate, a hollow indoor cylinder mem` ber having a free end and surrounding said keyhole of said indoor plate and integral therewith, an indoor disk including a keyhole similar as said front disk and mounted in said free end of said hollow indoor cylinder member, an

inner retainer ring channel on said hollow' indoor cylinder member adjacent said indoor disk, resiliently supported plate tumbler means anranged in said lock. casing 'and having tongues adapted to project out of said window-like openings, said lock casing being stationarily mounted in said cut-out portion and said two half-oasings and said tongues of said half casing meshing with said side slots and said `lock casing passing through said central opening of said latch body, said hollow outdoor cylinder member and hollow indoor cylinder member projecting out of said half-casings, said tongues of said plate tumbler means are capable of entering said slots of said upper and lower latch bar, each plate tumbler means further having a pair of side faces each including a mouth opening into said side faces and directed towards said keyhole of said outdoor plate at least one pair of mouths of one of said plate tumbler means being arranged at a different height than the remaining mouths, a hollow indoor knob anda hollow outdoor knob each having la projecting stem, said indoor knob being rotatably mounted on said hollow indoor cylinder member and having :at least one screw entering said inner retainer ring channel and said outdoor knob `being rotatably mounted on said hollow outdoorI cylinder member and having at least Ione screw entering said outer 4retainer ring channel, said stems projecitng into said recesses of said upper latch bar through said upper arcuate portions :of said cut-out portions, `and a key having a stepped dat 'bit for frontwise insertion through said keyholes into said mouths to withdraw said tongues from said slots into said look casing when inserted in `one way and to block said slots when inserted in any other way.

13. The door lock as claimed in claim 12, wherein said plate tumbler means consist of alternately arranged spacers and tumblers, said spacers are substantially H shaped `and have side faces eac-h including a mouth opening into said side faces and directed towards said keyholes of said outdoor plate and said indoor piate, said spacers being each of substantially the same shape and stationarily housed within said lock casing, said tumblters each having a pair of side faces each including a lateral inner mouth merging into an outer flared portion 1ending into said side faces, said outer dared portions being of larger size than said mouths of said spacers and said lateral inner mouths being of smaller size than said mouths of said spacers, said outer flared portions being directed towards said keyholes of :said indoor plate 'and outdoor plate, said lateral inner mouths of different tumblers being arranged at diiterent heights, said spacers and tumblers having aligned perforations, at least one flexible member passing through said aligned perforations whereby said tongues are capable of projecting out of 4said lock casing.

14. The door lock as claimed in claim l2, wherein said plate tumbler means consist of combined spacer and tumbler single piece members each having a main body, including a rear face, yan upper ear and a lower ear coplanar with said rear tace and of smaller width than said main body, said main body further comprising a pair of said faces, said mouths being arranged in said side faces.

15. The door lock as claimed in claim 13, wherein a snap latch is slidably housed in said two half-casings and projects out through said front plate, a stemv integral with said snap latch and housed in said two half-casings, a guiding slot in said stem, a stationary guide bushing in said two half-casings, said stem being slidably mounted by means of its guiding slot on said guide bushing, resilient means urging said snap ylatch out of said two halfcasings, a Vertical slot in said last mentioned stem adjacent said snap latch, a crank having a firs-t arm and a second arm and being rotatably mounted in said two halfcasings, said first arm meshing in said vertical slot, a pair of spaced apart follower hook arms swingably connected to said second arm, each of said follower hook arms having a free end hook, said free end hooks being arranged on either side of said latch body within said two 15 half-casings and wi-thin the path of said stems of said door knobs for operating said snap latch by means of said door knobs.

16. A padlock comprising a padlock casing, having a top face, a pair of lateral blind bores ending in said top face, a base opposite said top face, a central blind stepped bore ending in said base arranged in between said lateral bores, a cross channel passing through said lateral blind bores and central blind stepped bore, a latch body hav- 1ng a pair of outer side faces, a pair of side passages including a detent each, projecting into said side passages and a central passage in between said side passages, said side passages and central passage being of larger cross section than said lateral blind bores and said central blind stepped bore and capable of being in alignment therewith, a lock casing, a hollow cylinder member integral With said lock casing, said lock casing and hollow cylinder member being stationarily housed in said central blind stepped bore, said lock casing passing through said central passage, a bow having a longer branch and a shorter branch, said longer branch and shorter branch each having a recess adapted to be blocked by said detents, said longer branch being at least partially, resiliently housed in one of said lateral blind bores, sm'd shorter branch being adapted to enter the 'other of said lateral bores, a resilient means arranged in between said lock casing and said latch body adapted to urge said detents into said recesses, resiliently supported plate tumbler means arranged in said lock casing and having tongues adapted to project out of said lock casing, said latch body having slots adapted to be positioned in front of said tongues so that said tongues are capable of entering said slots, said hollow cylinder member including a keyhole connecting said hollow cylinder member with said lock casing, each plate tumbler means further having a side face including a mouth opening into said side face and directed towards said keyhole, at least one mouth of said plate tumbler means being arranged at a different height than the remaining mouths, and a key having a stepped ilat bit for frontwise insertion through said keyhole into said mouths to withdraw said tongues from said slots into said lock casing when inserted in said padlock to thereby enable to slide said latch body in a direction opposite the acting force of said resilient means to thereby withdraw said detents from said recesses in said bow.

17. The padlock as claimed in claim 16, wherein said bit comprises a spherical cap shaped depression, a key lock pin slidably housed in said lock casing below and substantially parallel to said plate tumbler means and adapted to project Iout of said lock casing, a cam portion in said latch body in operative relationship with said key lock pin adapted to press said key lock pin into said spherical cap shaped depression when said padlock is open.

18. lThe padlock as claimed in claim 16, wherein said plate tumbler means consist of alternately arranged spacers and tumblers, said spacers are substantially C shaped and have a side face, including a mouth opening into said side lface and directed towards said keyhole, said spacers being each or" substantially the same shape and stational1-ily housed within said lock casing, said tumblers each having a face including a lateral inner mouth merging into an outer flared portion ending into said side face, said outer ared portions being of larger size than said mouths of said spacers and said lateral inner mouths being of smaller size than said mouths of said spacers, said outer flared portions being directed towards said keyhole, said lateral inner mouths of diilerent tumblers being arranged at different heights, said spacers and tumblers having aligned perforations, at least one flexible member passing through said aligned perforations whereby said tongues are capable of projecting out of said lock casing.

19. The padlock as claimed in claim 16, wherein said longer branch comprises a vertical upstanding peripheral recess, an annular recess below said upstanding recess and connected thereto, a guide and stop pin rigidly mount- 1&5 ed in said padlock casing and capable of projecting into said upstanding recess and annular recess, said longer branch having a base, an axial blind bore in said longer branch and ending in said base, a spring housed in said axial blind bore and butting against said lateral blind bore of said padlock casing thereby urging said bow upwardly.

20. .A lock comprising a casing, a latch body having blocking means, said latch body being slidably housed in said casing, `a tumbler lock including a lock casing adadjacent said latch body and stationarily mounted in said casing, said lock casing comprising side walls delining at least one window-like opening in a plane substantially perpendicular to said side walls, plate tumbler means arranged in said lock casing and having tongues adapted to project out of said window-like opening, said tumbler means being slidably mounted for reciprocation in a direction perpendicular to the plane of said opening, said latch body including a latch bar having slots adapted to be positioned in front of said window-like opening so that said tongues are capable of entering said slots, one of said side walls at least having a keyhole, each plate tumbler means further having a side face including a mouth opening into said side face and directed towards said keyhole, at least one mouth of said plate tumbler means being arranged at a diiferent height than the remaining mouths, and a key having a stepped flat bit for rontwise insertion through said keyhole, the front of said bit titting into said months to withdraw said tongues from said slots into said lock casing.

21. A lock comprising a casing, a locking member, a tumbler lock including a lock casing adjacent said locking member, said lock casing comprising side walls delining at least one window-like opening in` a plane substantially perpendicular to said side walls, plate tumbler means arranged in said lock casing and having tongues. adapted to project out of said window-like opening, said plate tumbler means being slidably mounted for reciprocation in a direction perpendicular to the plane of said opening, said locking member having means adapted to interengage said tongues, said means being adapted to be positioned in front of said window-like open-ing so that said tongues are capable of interengaging said means, at least one of said walls having a keyhole, each plate tumbler means further having a side face including a mouth opening into said side face and directed towards said keyhole, at least one mouth of said plate tumbler means being arranged at a different height than the remaining mouth, and a key having a stepped flat bit for frontwise insertion through said keyhole, the front of said bit litting into said mouths to withdraw said tongues into said lock casing out of interengagement from said means on said locking member, one of said locking members and said lock casing being slidably mounted relative to the other.

22. A lock comprising a casing, a locking member, a tumbler :lock including a lock casing adjacent said locking member, said lock casing comprising side walls defining at least one window-like opening in a plane substantially perpendicular to said side walls, plate tumbler means arranged in ysaid lock casing and having tongues adapted to project out of said window-like opening, said plate tumbler means being slidably mounted for reciprocation in a direction perpendicular to the plane of said opening, said lock-ing member having means adapted to interengage said tongues, said means being adapted to be positioned in front of said window-like opening so that said tongues are capable of interengaging said means, at least one of `said walls having a keyhole, each plate tumbler means further having a side face including a mouth opening into said side face and directed towards said keyhole, at least one mouth of said plate tumbler means being arranged at a different height than the remaining mouth, and a key having a stepped llat bit for frontwise insertion throng-h said keyhole, the front of said bit litting into said mouths to withdraw said tongues into said lock casing out of interengagement from said means on 1 17 said locking member, said lock casing being stationarily mounted in said easing and said locking member being slidably mounted relative to said lock casing.

References Cited in the le of this patent UNITED STATES PATENTS 15 Croning July 17, 1928 Eichel Feb. 4, 1936 Wassenhove =Nov. 30, 1937 Hansen Dee. 27, 1938 Rolph Ian. 20, 1959 FOREIGN PATENTS Denmark July 17, 1922 lFranse Aug. 17, 1959 

1. A LOCK COMPRISING A CASING, A LATCH BODY HAVING BLOCKING MEANS, SAID LATCH BODY BEING SLIDABLY HOUSED IN SAID CASING, A TUMBLER LOCK INCLUDING A LOCK CASING ADJACENT SAID LATCH BODY AND STATIONARILY MOUNTED IN SAID CASING, SAID LOCK CASING COMPRISING SIDE WALLS DEFINING AT LEAST ONE WINDOW-LIKE OPENING IN A PLANE SUBSTANTIALLY PERPENDICULAR TO SAID SIDE WALLS, PLATE TUMBLER MEANS ARRANGED IN SAID LOCK CASING AND HAVING TONGUES ADAPTED TO PROJECT OUT OF SAID WINDOW-LIKE OPENING, SAID TUMBLER MEANS BEING SLIDABLY MOUNTED FOR RECIPROCATION IN A DIRECTION PERPENDICULAR TO THE PLANE OF SAID OPENING, SAID LATCH BODY INCLUDING A LATCH BAR HAVING SLOTS ADAPTED TO BE POSITIONED IN FRONT OF SAID WINDOW-LIKE OPENING SO THAT SAID TONGUES ARE CAPABLE OF ENTERING SAID SLOTS, ONE OF SAID SIDE WALLS AT LEAST HAVING A KEYHOLE, EACH PLATE TUMBLER MEANS FURTHER HAVING A SIDE FACE INCLUDING A MOUTH OPENING INTO SAID SIDE FACE AND DIRECTED TOWARDS SAID KEYHOLE, AT LEAST ONE MOUTH OF SAID PLATE TUMBLER MEANS BEING ARRANGED AT A DIFFERENT HEIGHT THAN THE REMAINING MOUTHS, AND A KEY HAVING A STEPPED FLAT BIT FOR FRONTWISE INSERTION THROUGH SAID KEYHOLE, THE FRONT OF SAID BIT FITTING INTO SAID MOUTHS TO WITHDRAW SAID TONGUES FROM SAID SLOTS INTO SAID LOCK CASING WHEN INSERTED IN ONE WAY AND TO BLOCK SAID SLOTS WHEN INSERTED IN ANOTHER WAY. 